for those wanting to play with formatting options, here is the link to the Markdown Cheat Sheet. This is the same page as the link Gina put at the top of most pages here that says "please use code blocks and syntax highlighting". (The difference is that this link takes you to the top of that page, rather than directly to the code block section).

I've found the headers, links, and lists sections helpful when trying to lay out a WiKi post to keep things organized. You can see some of these options in use in the WiKi in the FAQ section entitled Getting Your WiFi Connection Working (Despite my name on that post, Gina did most of the initial formatting of the raw text I entered. I've been copying/pasting/editing her formatting since then as I add to the WiKi)

I'm hopeful that the Discourse author will eventually include a more automated way to make a table of contents. This would be especially helpful for a WiKi-type post. It could be done now, but is a lot of manual work, an da lot of manual editing if you make changes, so I have not attempted it.